Transcript Astrogrid DSA - Institute of Astronomy RAS

AstroGrid RVO as a community
center.
Distant galaxy discovery
problem
Alexey Vovchenko (CMC MSU)
RVO Workshop
10.04.2006
AstroGrid RVO as a community
center
• AstroGrid RVO is organized as a community center
intended for solving different astronomical problems over
distributed repositories of astronomical data
accumulated around the world (observations data,
problem solution results, services of data and
information analysis).
• Put into operation, AstroGrid RVO is considered to be
one of the first steps in reaching the objectives of
Russian Virtual Observatory informational infrastructure
(RVOII).
• The Center has become operational at IPI RAS since
October 2005 on the base of the AstroGrid system,
developed at the UK and generously granted by the
authors to be used for the RVO.
Basic facilities
of the AstroGrid RVO
• Facilities for problem solving by scientists over
information accumulated in the VO (including tools for
workflow management, tools for managing common data
spaces for the group work, special tools for astronomical
data analysis);
• Tools for creating new services for information analysis;
• Facilities for setting data management systems and data
sets supported by such systems at the community
center;
• Tools for searching in the catalogues of the International
Virtual Observatory based on the IVOA standards;
• Tools for publishing astronomical observations results,
problem solving results, software services for the RVO
Metadata Registries in compliance with the IVOA
standards.
The first trial of the AstroGrid
RVO installation at IPI RAS
• In August - September 2005 applying the AstroGrid RVO
installation at IPI RAS, as the joint effort of the Special
Astrophysical Observatory of RAS (SAO RAS) and IPI
RAS, the information processing facilities have been
developed and tested for solving the Distant galaxy
discovery problem
• The problem statement has been provided by Olga
Zhelenkova (SAO RAS)
The problem overview
• The first astronomical problem that has been designed
by IPI RAS together with the Special Astrophysical
Observatory of RAS (SAO RAS) applying AstroGrid and
Aladin is a distant galaxy discovery in the sky strip
investigated in the “Cold” deep survey with the RATAN600 (large Russian radio telescope).
• For the beginning we used RCcatalogue as a list of radio
sources.
• The approach applied looks fairly simple.
• We need to select optical sources with certain properties
taken from DR 3 SDSS and crosssmatch them with the
RCcatalogue.
• The result of the crossmatch may contain candidates for
distant galaxies that should be analyzed further applying
their images and Aladin capabilities.
Information processing steps at
distant galaxy search
1. Radio sources search in RCcatalogue in the given sky
area
2. Optical sources search in SDSS DR3 catalogue in the
given sky area
3. Optical sources selection on the base of predicates
taking into account color values of sources
4. CrossMatch of the radio and optical sources, obtained
at the previous steps
5. Download the respective images from FIRST and SDSS
images archives, and provide their superposition.
Analyze the result
CEA-application,
MySpace and DSA
• CEA-interface provides access from the AstroGrid
system to the external applications
• Application, accessed from the AstroGrid system by the
CEA-interface, is known as CEA-Application
• MySpace is a storage file system for a user data:
queries, workflows, intermadiate results and final results
• DSA provides access from the AstroGrid system to local
data bases (PostgreSQL and MySQL)
Information processing steps in
AstroGrid system and Aladin
AstroGrid Workflow:
• Step1. RCcatalogue Query
• Step2. SDSS Query
• Step3. CrossMatch the results, obtained on
pervious steps
• Step4. Download images and provide
superposition of them
Aladin:
• Step5. Image analysis by a specialist
Step1. RCcatalogue Query
• CEA-Application is launched which
execute the ADQL query to the data base,
containing the RCcatalogue
– The local copy of RCcatalogue has been
created at PostgreSQL, and formed as an
AstroGrid DSA component
• Result obtained in the VOTable format has
been automatically placed into the
MySpace
Step1. RCcatalogue Query
Step1: Example of the
ADQL query
SELECT crd.ra, crd.de, cat.name
FROM RCCatalog as cat, CoordEQJ as crd
WHERE cat.coord_id = crd.coord_id
Step1: Example of a result
Step2. SDSS Query
• CEA-Application is launched, which,
applying the web-service provided by
SDSS (CasService
http://voservices.net/CasService/ws_v1_0/
CasService.asmx ), executes the query
• Result obtained in the VOTable format has
been automatically placed into the
MySpace
Step2: Example of a query
SELECT
ra=cast(ra as real), [dec]=cast([dec] as real),
objid, u, g, i, r, z,
colorIndexURG=(u+r)/2.0-g
FROM PhotoPrimary
WHERE ra BETWEEN 225.0 AND 225.5
AND [dec] BETWEEN 4.0 AND 5.61
AND r BETWEEN 15.0 AND 23.0
Step2. SDSS Query
Step3. CrossMatch the results
• CrossMatch the result of two previous
steps using CrossMatcher provided by
AstroGrid
(ivo://org.astrogrid/CrossMatcher).
• Result obtained in VOTable format has
been automatically placed into the
MySpace
• The result of the CrossMatch may contain
candidates for distant galaxies
Step3. CrossMatch the results
Step4. Downloading images and
providing superposition of them
Aladin Script
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reset; grid;
get DSS.ESO(DSS1,14.1,14.1) + adress + 5'; sync;
get NVSS(0.2,15.0,Stokes I,Sine) + adress + 5';
sync; contour 4;
get FIRST(10) + adress + 5';
sync; contour 4;
get SDSSDR3cat + adress + 1';
sync;
get VizieR(2mass) + adress + 1';
sync;
show 1; hide NVSS FIRST;
backup st.aj
Step4. Downloading images and
providing superposition of them
Step5. Image analysis by a
specialist
• Launching Aladin (version 3.030_votech)
• Launching Workbench
• Opening Aladin stack, saved in MySpace
on a previous step
• Viewing, analyzing, probably editing
obtained images using Aladin tools
Step5: An example of MySpace
access from Aladin
Step5: An example of images
obtained by Aladin
Step5: An example of images
obtained by Aladin
Distant galaxy discovery tools
(reported in the talk) applying the
AstroGrid RVO and Aladin will be
demonstrated tomorrow at the
demo session (starts at 11:50)
Как стать пользователем
системы АстроГрид РВО
•
Для того, чтобы стать пользователем АстроГрид РВО, необходимо
послать электронное письмо по адресу [email protected]. Письмо должно
содержать следующую информацию:
– имя, фамилия, e-mail, [почтовый адрес, телефон] контактного лица,
желающего зарегистрировать пользователя или группу пользователей в
АстроГрид РВО;
– наименование, [почтовый адрес, телефон] организации, которую
представляет контактное лицо;
– список имен пользователей АстроГрид РВО (имя пользователя должно
состоять из символов латинского алфавита, числом не менее 5);
– список желаемых имен групп и желаемое разбиение пользователей на
группы.
•
•
В случае, если вся необходимая информация предоставлена в
корректном виде, пользователи (группы пользователей) будут
зарегистрированы в сообществе ipi.ac.ru АстроГрид РВО. По
указанному контактному электронному адресу будут высланы пароли
для входа в портал АстроГрид РВО. Вход в портал осуществляется по
адресу
http://astrogrid.ipi.ac.ru:8080/astrogrid-portal/
Как стать пользователем
системы АстроГрид РВО
• Базы данных, а также программные сервисы могут быть
размещены на серверах АстроГрид РВО в ИПИ РАН. Заявку на
размещение необходимо послать по адресу [email protected].
Заявка должно содержать следующую информацию:
– имя, фамилия, e-mail, [почтовый адрес, телефон] контактного лица,
желающего разместить сервис или базу данных на сервере
АстроГрид РВО;
– наименование, [почтовый адрес, телефон] организации, которую
представляет контактное лицо;
– краткое описание сервиса или базы данных, предлагаемых для
размещения.
• Дальнейшее согласование по вопросам размещения будет
проводиться по электронной почте.
• Согласование о порядке проведения возможных консультаций
по пользованию АстроГрид РВО осуществляется по
электронной почте [email protected] или телефонам в Москве (495)
1292098, 1291843.